Silencer for vacuum cleaner

ABSTRACT

The present invention provides a silencer for a vacuum cleaner. The silencer for the vacuum cleaner comprises at least one silencing board mounted in an exhaust channel of the vacuum cleaner for passage of an exhaust airflow from the vacuum cleaner. A plurality of pores are distributed throughout in the silencing board. The silencing board is mounted in an orientation perpendicular to the direction of the airflow through the exhaust channel. The silencer for a vacuum cleaner can considerably diminish the noise generated by the vacuum cleaner in operation.

FIELD OF THE INVENTION

The invention relates to a silencer for a vacuum cleaner.

BACKGROUND OF THE INVENTION

In conventional exhaust air silencers for vacuum cleaners, the noise isreduced by means of increasing the tortuosity of the airflow channel,i.e. by using labyrinthic airflow channels, to dissipate sound energyand by means of disposing porous sound-absorbing materials at theturning corners of the airflow channel to absorb sound energy. Poornoise silencing effect, however, is the main disadvantage of theabove-mentioned silencing structures.

SUMMARY OF THE INVENTION

The object of the invention is to provide a silencer for a vacuumcleaner, which utilizes one or more silencing boards mounted in theexhaust channel to considerably diminish the noise generated by a vacuumcleaner in operation.

In one aspect of the invention, a silencer for a vacuum cleanercomprises at least one silencing board mounted in an exhaust channel ofthe vacuum cleaner for passage of an exhaust airflow from the vacuumcleaner. A plurality of pores are distributed throughout in thesilencing board.

In a further aspect of the invention, a silencer for a vacuum cleanercomprises at least one silencing board mounted in an exhaust channel ofthe vacuum cleaner for passage of an exhaust airflow from the vacuumcleaner. A plurality of pores are distributed throughout in thesilencing board. The silencing board is mounted in an orientationperpendicular to the direction of the airflow passing through theexhaust channel.

In a more detailed aspect of the invention, a silencer for a vacuumcleaner comprises at least one silencing board mounted in an exhaustchannel of the vacuum cleaner for passage of an exhaust airflow from thevacuum cleaner. A plurality of pores are distributed throughout in eachof the at least one silencing board. The silencing board is mounted inan orientation perpendicular to the direction of the airflow through theexhaust channel. The total passage area of the pores is less than halfof the cross-sectional area of the exhaust channel. The diameter of eachpor in the silencing board is less than 6 mm, and wherein the thicknessof the silencing board is larger than 0.5 mm.

The invention provides the following advantages:

1. In the invention, one or more silencing boards are mounted in theexhaust channel, which can effectively diminish the noise generated by avacuum cleaner in operation.

2. The silencing board(s) of the invention can be directly mounted inthe exhaust channel, or be mounted in an expansion chamber connected tothe exhaust channel. The latter with the silencing board(s) mountedwithin an expansion chamber will obtain a better effect of noisereduction.

BRIEF DESCRIPTION OF THE DRAWINGS:

FIG. 1 is a sectional view schematically illustrating a silencer for avacuum cleaner according to the preferred embodiment of the presentinvention, wherein:

the numeral 1 denotes a silencing board, 2 denotes pores, and 3 denotesan exhaust channel.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The invention is described bellow with reference to the preferredembodiment of the invention shown in FIG. 1.

As shown in FIG. 1, a silencer for a vacuum cleaner comprises threesilencing boards 1 mounted in the exhaust channel 3. The silencingboards 1 are generally made of plastic material or metal. A plurality ofpores 2 are distributed throughout in each of the silencing boards 1.Each of the silencing board 1 is mounted in an orientation perpendicularto the direction of the airflow passing through the exhaust channel 3.The total passage area of the pores 2 in each of the silencing boards 1is less than half of the cross-sectional area of the exhaust channel 3.The diameter of each of the pores 2 in the silencing boards 1 are lessthan 6 mm and the thickness of each of the silencing boards 1 is largerthan 0.5 mm.

In the invention, one or more silencing boards 1 are mounted in theexhaust channel 3, which can effectively reduce the noise generated by avacuum cleaner in operation. The silencing board(s) 1 of the inventioncan be directly mounted in the exhaust channel 3, or be mounted in anexpansion chamber connected to the exhaust channel 3. The latter withthe silencing board(s) mounted within an expansion chamber will obtain abetter effect of noise reduction.

1. A silencer for a vacuum cleaner, which comprises at least onesilencing board mounted in an exhaust channel of the vacuum cleaner forpassage of an exhaust airflow from the vacuum cleaner, with a pluralityof pores (2) distributed throughout in the silencing board.
 2. Asilencer for a vacuum cleaner according to claim 1 wherein the silencingboard is mounted in an orientation perpendicular to the direction of theairflow passing through the exhaust channel.
 3. A silencer for a vacuumcleaner according to claim 1 wherein the total passage area of the poresis less than half of the cross-sectional area of the exhaust channel. 4.A silencer for a vacuum cleaner according to claim 1 wherein thediameter of each of the pores in the silencing board is less than 6 mm.5. (Cancelled).